PARIS — Kate Millett, the activist, artist, and educator whose best-selling work ‘‘Sexual Politics’’ was a landmark of cultural criticism and a manifesto for the modern feminist movement, died Wednesday. She was 82.

Ms. Millett’s book was among the most talked-about works of its time and remains a founding text for cultural and gender studies programs. Her power reached across generations and across borders — and condolences filled social networks in multiple languages Thursday.

Ms. Millett died while on vacation with her spouse, Sophie Keir, with whom she had had a relationship of many years; they recently married. Keir told The New York Times by e-mail that the cause was cardiac arrest. The two had been going to Paris annually to celebrate their birthdays, she said, adding Ms. Millett had had long ties to the women’s movement in France.

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‘‘Sexual Politics’’ was published in 1970 in the midst of feminism’s so-called ‘‘second wave,’’ when Gloria Steinem, Betty Friedan, Ms. Millett, and others built upon the achievements of women’s suffragists from a half-century earlier. Together they challenged assumptions about women in virtually every aspect of society.

Steinem posted a tribute on Facebook: ‘‘As Andrea Dworkin said, ‘The world was asleep, but Kate Millett woke it up.’ Sexual Politics — and all Kate’s work — will keep us Woke.’’

‘‘Sexual Politics’’ chronicled centuries of legal, political, and cultural exclusion and diminishment of women, from the ‘‘penis envy’’ theory of Sigmund Freud to the portrayals of women as disrupters of paradise in the Bible and Greek mythology. She labeled traditional marriage an artifact of patriarchy and concluded with chapters condemning the misogyny of authors Henry Miller, D.H. Lawrence, and Norman Mailer, but also expressing faith in the redemptive power of women’s liberation.

‘‘It may be that a second wave of the sexual revolution might at last accomplish its aim of freeing half the race from its immemorial subordination — and in the process bring us all a great deal closer to humanity,’’ she wrote.

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While countless women were radicalized by her book, Ms. Millett would grow to have bittersweet feelings about ‘‘Sexual Politics,’’ which later fell out of print. She was unhappy with its ‘‘mandarin mid-Atlantic’’ prose and overwhelmed by her sudden transformation from graduate student and artist to a feminist celebrity whose image appeared on the cover of Time magazine.

Amused at first by her fame, Ms. Millett said she was worn down by a ‘‘ruin of interviews, articles, attacks.’’

‘‘Soon it grew tedious, an indignity,’’ she wrote in the memoir ‘‘Flying,’’ published in 1974.

She was dubbed by Time to be ‘‘the Mao Tse-tung of Women’s Liberation,’’ and rebutted by Mailer in his book ‘‘The Prisoner of Sex,’’ in which he mocked her as ‘‘the Battling Annie of some new prudery.’’

Meanwhile, she faced taunts from some feminists for saying she was bisexual while she was married but not saying she was gay. During an appearance by Ms. Millett at Columbia University, an activist stood up and yelled, ‘‘Are you a lesbian? Say it. Are you?’’

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“Five hundred people looking at me. Are you a Lesbian?’’ Ms. Millett wrote. ‘‘Everything pauses, faces look up in terrible silence. I hear them not breathe. That word in public, the word I waited half a lifetime to hear. Finally I am accused. ‘Say it. Say you are a Lesbian!’

‘She pioneered feminist thought [and] de-stigmatized mental illness.’

Lena Dunham, in a tweeted tribute to Ms. Millett

‘‘Yes, I said. Yes. Because I know what she means. The line goes, inflexible as a fascist edict, that bisexuality is a cop-out. Yes, I said, yes I am a lesbian. It was the last strength I had.’’

Ms. Millett’s books after ‘‘Sexual Politics’’ were far more personal and self-consciously literary, whether ‘‘Flying’’ or ‘‘Sita,’’ a memoir about her sexuality in which she wrote of a lesbian lover who committed suicide. ‘‘The Loony Bin Trip’’ chronicled her struggles with manic depression and time spent in psychiatric wards.

‘‘There is no denying the misery and stress of life,’’ she wrote. ‘‘The swarms of fears, the blocks to confidence, the crises of decision and choice.’’

The daughter of Irish Catholics, Ms. Millett was born in 1934 in St. Paul, Minn., and was long haunted by her father, who struggled with alcoholism, beat his children, and left his family when Ms. Millett was 14. She attended parochial schools as a child and studied English literature at the University of Minnesota and St. Hilda’s College, Oxford, from which she graduated with honors.

Ms. Millett lived briefly in Japan, where she met her future husband and fellow sculptor Fumio Yoshimura. They moved to Manhattan in 1963 and divorced in 1985.

She joined the National Organization for Women and began attracting a following for her sculptures, which have been exhibited worldwide. Through her own Women’s Liberation Cinema production company, she directed the acclaimed feminist documentary ‘‘Three Lives.’’ She also founded the Women’s Art Colony Farm in Poughkeepsie, N.Y.

Ms. Millett taught at several schools, including the University of North Carolina and New York University. In 1968, she was fired as an English lecturer at Barnard College, a decision that stemmed at least in part from her support of student protests against the Vietnam War. The extra free time allowed her to complete ‘‘Sexual Politics,’’ which began as her doctoral thesis at Columbia.

Employees of the French publishing house Editions des Femmes held an impromptu gathering Thursday when they learned of her death, sharing memories of a woman who came regularly to Paris for more than 40 years to share ideas and plan out activism.

‘‘She was a pioneer, a pillar of global feminism . . . a true creator,’’ said longtime friend Catherine Guyot at the publishing house. ‘‘We were not always in agreement. We talked about going beyond feminism . . . but she always discussed with pleasure.’’

Ms. Millett was honored several times late in life. In 2012, she was given the Pioneer Award from the Lambda Literary Foundation and the same year was presented a Courage Award for the Arts prize by her longtime friend Yoko Ono. Ms. Millett was inducted into the National Women’s Hall of Fame in 2013 and, in her acceptance speech, reflected on her years as an activist.

‘‘The happiness of those times, the joy of participation, the excitement of being part of my own time, of living on the edge, of being so close to events you can almost intuit them. To raise one’s voice in protest, just as the protest is expressed in life, in the streets, in relationships and friendships,’’ she said. ‘‘Then, in a moment of public recognition, the face of the individual becomes a woman’s face.’’

Steinem said Ms. Millett’s ashes would be brought home but information about memorial arrangements was not immediately available.